US1860885A - Vacuum cleaner - Google Patents

Description

May 31, 1932. BlLDE 1,860,885

VACUUM CLEANER File 'd March l. 1939 5 Sheets-$heet l INVENTOR I 87nd M QM! 'M May 31, 1932. 'r. E. D. BILDE 1,360,885

VACUUM CLEANER Filed March 1. 1950 5 Sheets-Sheet 2 z Q 3 a. 3 3% Q bv Q & a mm i R H a hfi 1 w bm mm Q Q n mm N km r a R 5 vm Wm mw BA y 31, 1932: T. E. D. BILDE 7 1,860,885

VACUUM CLEANER Fild March 1, 1950 3 Sheets-Sheet Patented May 31, 1.932

UNITED STATES PATENT OFFICE TORD ERIK DANIEL BILDE, F STOCKHOLM, SWEDEN, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO ELECTROLUX CORPORATION, A CORPORATION OF DEAWARE' vacuum CLEANER Application filed March 1, 1930, Serial No.

6 tor unit and associated mechanism.

The nature, objects and advantages of the invention will be pointed out as the description proceeds.

Referring to the accompanying drawings which form a part of-this s ecification and show various embodimentso the invention:

Fig. 1 is a side elevation of a vacuum cleaner constructed in accordance with the present invention;

Fig. 2 is a longitudinal section through the vacuum cleaner unit;

Fig. 3 is a transverse section of the motor v and supports therefor with the hood partly broken away;

Fig. 4 is a sectional view of the insulating ring- Figs. 5, 6 and 7 are enlarged detail views, partly in section, of the supporting mechanism;

Fig. 8 is a side view of the hood;

Fig. 9 is a sectional view of a portion of the unit showing a modified form of support;

Figs. 10 and 11 are enlarged detail views, partly in section, of the support of Fig. 9;

V Fig. 12 1s asectional view of a portion of the unit showing a further modified support;

. Fig. 13 is an enlarged sectional view of the support of Fig. 12;

Figs. 14 and 15 are sectional views of further modified forms of supports; and

Fig. 16 isya detail view of a portion of the support of Fig. 15.

Like reference characters denote like parts in the several figures of the drawings.

In the following description and in the claims parts will be identified by specific names for convenience, but they are intended to be as generic in their application to similar parts as the art will permit.

In Figures 1 and 2, 10 denotes the main outer casing of the cleaner which comprises an elongated cylindrical barrel portion to which are attached end caps 11 and 12. Openings 13 and 14 respectively are provided in the end caps 11 and 12 and are threaded to 432,315, and in Germany larch 5, 192a.

receive a plug 16 formed'with the normal suction or blowin aperture 15. The plug 16 can be replaceably arranged in the opening 13 or the opening l tdepending on the manner of operating the cleaner. A tube 17 is fixed in the opening 15 and is connected to the suction nozzle 20 by two tube members 18 and 19. The arrangement is such that -the suction nozzle may be affixed directly on the tube or hose 17 or use may be made of one or both tube members 18 and 19.

The barrel portion of the casing 10 is provided at its ends with rings 21 and 22- on which lugs 23 and 21 are rovided. These rings are preferably ma e of aluminum. The lugs are apertured in a direction extending longitudinally of the cleaner and are adapted to receive'runners'25 supporting the apparatus. The openings in the lugs as well as the runners themselves are'preferably of oval cross section in order to prevent rotation of the runners therein as shown in U. S. Patent to Engherg et al., No. 1,757,239, dated May 6, 1930. The runners may be held in the openings in'the lugs by their own resilient action. For more securely fastening the runner ends in the lugs the material surrounding the entry openings can be upset slightly relatively to the ends of the runners. In this last case it is unnecessary to construct the runners resiliently. For carrying the apparatus a handle 26 is provided which is preferably resilient and encased with leather or the like and supported in caps 27 and 28.

In the casing 10 (Fig. 2) is provided a dust bag 29, a two-sta e centrifugal fan 30, the driving motor 31 or rotating the fan and a bacteria filter 32. The dust bag 29 is secured in known manner to a metal ring 33 which is clamped tightly between the ring 21 and the front end cap, with'the interposition of rubber packing 34. The caps 11 and 12 are held on the casing 10 by means of toggle lever catches 35 and 36 or like means.

Between the ring 22 (Fi 2) andthe end cap 12, is inserted a ring37 formed of insulating material such as an artificial resin, hard rubber, phenol condensation product, or the like. The ring 37 is secured to the ring 22 by screws 38 arranged in recesses in the former, the screws 38 being screwed into lugs cast with the ring 22. Between the rings 22 and 37 is inserted a packing ring 40.preferably formed of rubber. he ring 37 is 5 constructed at its right edge (Figs. 2 thru 6) I with an annular groove 42 into which a packing ring 41 of rubber or the like is introduced, the front edge of the end cap 12 being pressed a ainst the packing ring. At its ront edge (Figs. 2 an 4) the ring 37 is formed with three lugs 43 which are provided with axial openings 44 extending therethrough. The housing of the motor 31 gig. 2) includes a main ortion 45 and a nt cover 46. The two ousing members are formed at their peripheries with'three ears or lugs 47 and 48 respectively1 which are preferabl cast integral with t e housing rts. The lugs 48 of cover 46 (Fig. 6) are i drmed with apertures 49 which are axial with respect to the motor and the lugs 47 are also axially recessed or apertured as at 50 (Fig. 6) and the apertures thereof have a cross section corresponding to that of aper-.

* tures 49. The motor housing part 45 and its cover 46. are held together by threaded bolts 51 which pass through the openings 44, 49

and 50 a washer 52 being located on the left side (Figs. 2 and 6) of the lugs 48 in front of the apertures 49 and the bolts 51 being screwed into the bottom of the recesses 50.

The bolts 51 are formed at their right ends with flanges 53 which ma consist of washers screwed on the bolts. ach of the bolts is 35 surrounded by a helical spring 54, the rear turns 55 of which are reduced so as to abut against the flange 53. The rear part of the spring shown in Fig. 6 is partly cut away.

The front or left turn 56 ofeach spring is on the other hand bent outor enlarged so as not to be forced into the opening on tightening the bolt 51. The outer diameter of the springs 54 is preferably chosen sufliciently large to fill completely the cross section of the bores 49, 44 and 50. During manufacture the springs 54 are preferably kept sufiiciently short as to be slightl tensioned, on the assembly of the motor unit in the cleaner, between the flange 53 and the washer 52 engaging the I W turn 56.

In order to'prevent axial movement of the motor unit comprising the motor and the fan rotors and movement of the springs in x the openin s 44, distance or spacing sleeves 55 57 surrouniin the springs 54, for example of rubber or li e insulating material are provided between the lugs 43 and the lugs 48 or 47. The supports for the motor unit, that is, the In 43, contact substantially with the middle 0 springs 54.

The front or left edge of the ring 37 (Figs, 4, 5 and 6) is formed with an annular groove or shoulder 58 against which abuts an inner housing or casing part or. hood 59 surrounding the rear fan rotor or centrifuge 30 (Fig.

This housing member 59 is formed with "ber 61 is drawn tightagainst the housing member 59 and the latter against the recess of .ring 37. The recesses 66 are formed in projections 67 of the ring.

The centrifuges 30 (Fig. 2) are removably secured to shaft 68 of the motor 31 by a common nut 69. Between the centrifuges is a deflector arrangement or air guide 70 which is fastened to the front wall 71 of the hood .59. This front wall 71 and the front wall 72 of hood 61 are provided with air inlet openings 73 and 74 respectively. The opening 74 is covered by a rforated disc 7 4' which prevents the undesired entry of extraneous par- .ticles into the centrifuges and motor. The

parts'or hoods enclosing the centrifuges are therefore, as is obvious from Fig. 2, not united with or connected to the movable and resilient parts of the cleaner such as the motor but are rigidly connected with the main outer casing itself. This has the advantage that the fan housing parts do not produce any objectionable noise. Also they are electrically insulated from'the current carrying members arranged on the ring 37.

Between the rearmost fan member and the cover '46 there is provided a shield or re.- circulation member 110 having a central opening 111 for the passage of. air therethrough. The outer edge of shield 110 is bent to provide a cone-sha d flange 112 to form with hood 59 an annu ar air channel through which the air is forced by the action of fans 30.. .Suitable. uiding mechanism may be mounted in sand channel to counteract the circular movement of the air and cause the same to flow in anaxial direction. At the rear side of the rear centrifugal fan member 30 small auxiliary blades 113 may be formed which, in connection with the action of said fan, draw air through the motor and discharge the same around the flange 112. This action assists in cooling the motor by establishing a counter current of air within the motor chamber.

The top part of the ring 37 is constructed with a pro ection 75 in which are provided two semi-cylindrical recesses 76 (Fig. 3) containing the contact pins 77 which serve for connection to the electric conductor wire. Each of the contact pins 77 is rigidly connected with a metal plate 78 which extends screws78'. Ihe right-hand plate (Fig pole of the switch are COIldllClllVGlY through openings in the ring 37 or can be moulded rigidly therein. On the inner side of the ring 37 is mounted the switch 7 9adapted to switch the motor current on and oil. The wires-leading to the motor and to the switch are attached to the metal plates 78 and one connecte by a metal band 7 9. The lever 80 of the switch extends through an opening 81 ver 80 to control the position thereof "and to thereby control the operationof the motor. The bar, as can be seen from Fig. 3,.is carried in openings in the side walls of the cap 28 and is adapted to slide transversely with respect thereto and to extend outside ofsaid cap to afford access for manual operation and preferably consists of insulating material such as an artificial resin, rubber, phenol condensation product, or the like; On to and fro movement ofthe bar 83the switch lever will be operated and will switch the current on or off. The coupling elements 77 are also located in the immediate vicinity of the switch and form a unit therewith. The cap '28 which is secured to the ring- 22 by a screw 84 serves not only as a bearing for the handle 26 and for covering the switch and coupling elements 77, but also as a protection against contact with the latter. As will be seen from the-above, theentire current carrying members of the cleaner, that is to say, the motor unit, the switch and the coupling elements for the supply cable are supported on an annular member consisting of insulating material and form a unit easily removable from the apparatus.

In order that the operator, even if removing the cover 12, shall not come in contact with the current carrying elements, a hood or inner casing member 85 (Figs. 2, 3 and 8) is provided which is secured to lugs 87' formed on the ring 37 by screw bolts 86. The front edge of the hood 85 lies against the ring 37 and as seen in Figs. 2, 6 and 7 is surrounded by the packing ring 41., The rear wall of the hood 85, formed preferably coneshaped, is provided with openings 88 to allow passage of the air from the fan or blower 30. To facilitate the replacement of the carbon brushes of the motor 31 Without necessitating the removal of the hood 85 the latter is formed with depressions 89 and openings 90 (Figs. 3, 7, and 8) through which the caps 91, by means of which the carbon brushes are held in position, project slightly and can be unscrewed.

The end cap '12 contains, as above mentioned, a filter 32 which is arranged therein in easily removable manner. The filter .32

consists of two layers 92 of material which are stretched over a ring 93 preferably of metal and may consist of a bacteria-catching material such as flannel. The rear layer of the filter contacts with a wall 94 of metal gauze arranged in the end cap 12.

Within filter 32, between layers 92, is provided a bag 114 of unglued (unsized) paper,

or similar material, containing solid particles or-a gas or liquid absorbed in a solid adsorbent such as infusorial earth. A deodorizing, disinfecting, insecticidal, perfuming, or other air conditioning substance, may beemployed. Said bag, or the space between.

layers 92, may, however, be filled with a orous, loose material which impedes the ow of bacteria, as for example, cotton or wool wadding. The layers 92, or the material therebetween, may be treated with any air conditioning substance. In a preferred form, the bag 114, of unglued paper, containing a disinfecting or deodorizing liquid adsorbed in kieselguhr or infusorial earth, has been used. v

In order that it may be placed on the casin 10 in one position, only the cap 12 is pro vided with a stud 95, which, on application of the end caps, slides in a corresponding guide 96 formed in the hood. The toggle lever catches 36 in the operating position engage in a circular depression formed in-the end cap 12. r

,The blowing-aperture 14 (Fig. 2) of the cleaner is located in an annular member or ring 98 fixed to the end cap 12. In order to direct the air flowing out of thecleaner away from the floor, the ring 98 isprovided with inclined guide plates 99 which can be cast integrally with said ring. This structure forms the subject matter of my copending application Serial No. 431,360, filed February 26, 1930. v

The cleaner is, as can be seen from the above, divided into three compartments-the chamber containing the dust bag, the chamber containingthe movmg parts, that is the ries the motor and the fan rotors and the electric connections including the switch, all

V springs 128 are seated.

01 which tow a unit. This unit includes all the moving parts and the moving parts are resiliently 1 "T i'liod on the ring The unit thus descrmerl is enclosed in an inner casing composed of the housing parts or hoods or partitil'ins 59., 61 and 35. t will be clear from the above description and the drawings that the forward fan rotor must be removedto slide the hood 59 and the at tached guide in place. IV hen. these parts are assembled, the motor fan assembly is enclosed in an inner casing. But this inner casing is not attached to any of the moving or vibratory parts. but is rigidly attached to the base ring 37. .Then the outer casing is applied and the outer casing (10, 11, 12. etc.) is attached to the base ring 37 independently of the motor and the inside casing (59, 61, 85).

If desired, a further filter can be located between the dust bag and the motor unit as illustrated in the patent to Engberg ct al above mentioned.

In the modification shown in Figs. 9 to 11, the housing of the motor 31 is provided with fork-shaped supporting members 120 which may be integrally cast thereon. Within housing 10 a ring 121 of metal or other,

stiff material is provided, to which is fastened members 122 which are formed with a hook extension 123. Members 122 and ring 121 are secured in housing 10 by screws 124 which pass through said elements. A packing material 125 of .suitable resilient substance is mounted between ring 121 and projection 123 of members 122. Housing 59 may be clamped between ring 121 and members 122 and further secured by rivets 126, if desired. Projections 123 are provided with perforations or apertures 127 in which spiral Sleeves 129, of resilient material such as hard rubber, provided with a double conical bore, are inserted over spring 127. The surface of each sleeve is recessed to receive the fork-shaped supporting member 120. Springs 128 are held in recesses 127 by means of bolts 130 and washers 131.

Sl'eews 129 are preferably formed of electrical insulating material whereby the motor unit is insulated from members 122 and from housing 10. The particular shape of the sleeve enables the maximum resilience of springs 128 to be utilized, and at the same time prevents axial movement of the motor. If sleeves 129 are formed of resilient material. the surface thereof is made slightly larger than the opening of the forks in members 120, so that a firm gripping action is obtained when said members are forced into place. i

In the modification shown in Figs. 12 and 13, the lugs 47 and 48 are provided with recesses or apertures 135 aligned with bores or apertures 44 of lugs 43. Springs 136, im-

bedded in sleeves 138, of resilient material such as rubber, are seated in recesses 135 and pass through bores in lugs 43. Sleeves 138 are provided with recesses 139 in which lugs 43 seat, thereby preventing axial motion of the motor unit. The rubber sleeves insulate the motor unit from the casing and assist the springs in providing a resilient suspension.

In the modified form shown in Fig. 1-1, springs 136 are directly seated in recesses 135 and are passed through sleeves 140 of resilient material such as rubber. Sleeves 140 pass through bores 44 and insulate the motor unit in a manner similar to sleeves 138 of F ig; 13. V sleeves 140 between lugs 47, 48 and lugs 37 for preventing axial movement of the unit. Sleeves 141 may also be formed of insulating material such as rubber or phenol condensation product.

In the modification shown in Figs. 15 and 16, the elements which are similar to those shown in Fig. 6 are given corresponding reference numerals. In this form, however,'axial'movement is substantially prevented by nut-s 150, which are provided with internal threads 151 meshing with the convolutions of spring 54. Said nuts are threaded over said spring against the lugs 43 of rings 37 and prevent axial movement of the spring with respect thereto. It is to be noted that in this form a,li1nite'd axial movement is afforded by the free convolutions of a spring and a substantially free suspension is obtained. The movement of the motor unit, however, is limited to sufliciently narrow limits to prevent derangement of the parts.

Inthe'above described mechanism, the entire motor unit, including the fans 30, is resiliently supported with the casing 10 in such manner that it may be easily removed from the apparatus for purposes of repair or replacement. Furthermore, the supporting mechanism effectively insulates all of the current carrying elements, whereby danger of accidental shock is eliminated. The housing for the fans 30 is rigidly supported on the insulating ring in such manner that the fans are free to vibrate with respect thereto. A single element, namely, ring 37, is used for supporting the entire motor unit as well as the housings dividing the casing into a plurality of compartments. By locating the filter between the motor unit and the outlet port, the air may be discharged in a substantially clean condition, whereas vanes 99 direct the air away from the floor and prevent the same from picking up dust and other particles therefrom.

It is to be understood that various features of the invention may be applied to other devices and to vacuum cleaners of other types.

While certain novel features of the invention have been shown and described and are Spacing sleeves 141 surround pointed out in the annexed claims, it will be understood that various omissions, substitutions and changes in the forms and details of the device illustrated and in its operation may be made by those skilled in the art without'departing from the spirit of the invention.

What I claim is:

1. In a vacuum cleaner, an extended cas ing, means for mounting said casing horizontally above a horizontal surface, a motor unit, and means for supporting said motor unit horizontally in said casing comprising axia 'ly extending coil springs peripherally displaced about said motor unit and said casing.

2. In a vacuum cleaner, an extended casing, means for mounting said casing horizontally above a horizontal surface, a motor unit, and means said casing with its axis horizontal comprising axially extending coil springs peripherally spaced about said motor unit, and said springs having intermediate and end portions held by the casing and the motor respectively, and said springs having yieldable port-ions between the held portions.

3. A vacuum cleaner unit having a cylindrical casing, means for mounting said casing horizontally above a horizontal surface, a motor unit, and means for mounting said motor unit axially in said casing comprising coil springs extending substantially parallel to the axis of said casing and peripherally spaced about said motor unit and interconnecting said casingwith said motorunit, said springs being normally maintained under stress.

4. Ina vacuum cleaner unit, a casing, a motor having a housing, pairs of lugs formed on said housing, cooperating lugs associated with said casing, coil supporting springs having end portions mounted in said housing lugs, and an intermediate portion of said springs carried by said casing lugs.

5. In a vacuum cleaner, a cylindrical casing, means for supporting said casing horizontally above'a horizontal surface, a motor having a housing, and means for supporting said motor axially of said casing comprisingpairs of lugs on said housing, cooperating lugs associated with said casing, and axially -extending coil supporting springs having their end portions mounted in said housing lugs and then-intermediate portions carried by said casing lugs.

. 6. In a vacuum cleaner. an extended casing. means for supporting said casing horizontally above a horizontal surface. a motor having a housing. and means for supporting said motor in said casing so that the rotor thereof rotates on an axis longitudinal of the casing comprising pairs oi lugs on said housing, cooperating lugs associated with said casing, axially extending coil supporting springs having intermediate portions carried by said for mounting said motor unit in casing lugs, and bolts extending within the springs holding the end portions of the springs in said housing lugs.

7. In a vacuum cleaner unit, a casing, a motor having a housing, pairs of lugs formed on said housing, cooperating lugs associated with said casing, coil supporting springs having end portions mounted in said housing lugs, an intermediate portion of said springs being carried by said casing lugs, and means associated with said lugs forpreventing substantial axial movement of said springs.

8. In a vacuum cleaner, a cylindrical casing, means ,for supporting said casing horizontally above a horizontal surface, a motor having a housing, and means for supporting said motor axially of said casing comprising pairs of lugs on said housing, cooperating lugs associated with said casing axially extending coil supporting sprin s having their end portions mounted in said housing lugs and their intermediate portions carried b said casing lugs, and means associated wit said lugs for preventing substantial axial movement of said springs.

9. In a vacuum cleaner, an extended casing, means for supporting said casing horizontally above a horizontal surface, a motor having a housing, and means for supporting said motor in said casing so that the rotor thereof rotates on an axis longitudinal of the casing comprising pairs of lugs on said housing, cooperating lu s associated with said casing, axially exten ing coil supporting springs having intermediate portions carried by said casing, bolts extending within the springs holding the end portions of the springs in said housing lugs, and means associated with said lugs for preventing substantial axial move ment of said springs.

10. In a. vacuum cleaner unit, a casing, a motor having a housing, pairs of lugs formed on said housing, cooperating lugs associated with said casing, coil supporting springs having end portions mounted in said housinglugs, an intermediate portion of said springs being carried bi said casing lugs, and means associated wit said casing lugs for preventing substantial axial movement of said springs, said last-mentioned means comprising nuts threaded to receive the convolutions of said springs, said nuts being threaded on said springs in engagement with said casing lugs.

11. In a vacuum cleaner unit, a casing, a motor having a housing, pairs of lugs formed on said housing, cooperatinglugs associated with said casing, coil springs in-terconneetin said lugs, and bolts passing within sai springs and lugs for maintaining the same in load supporting position.

12. In a vacuum cleaner, an extended casing, meansfor supporting said casing horizontally above a horizontal surface, a motor having a housing, pairs of lugs formed on said housing, cooperating intermediate lugs associated with said casing, coil springs supported intermediate their ends by said intermediate lugs and extending longitudinally of the casing, the end portions of said springs being positioned in said housing lugs, and bolts passing within said springs and some of said lugs and screwed into other of said lugs, said lugs, springs and bolts supporting said motor so that the rotor thereof rotates on an axis longitudinal of said casing.

13. In a vacuum cleaner, a cylindrical casing, means for supporting said casing so that its axis is horizontal when resting on a horizontal surface, a motor having a housing, and means for supporting said motor in said casing so that the rotor thereof rotates on a horizontal axis when the casing is disposed horizontally, saidsupporting means comprising pairs of apertured lugs on said housing, intermediate apertured lugs associated with said casing, coil springs passing through the apertures of the intermediate lugs and having end portions in the apertures of the first-mentioned lugs, and bolts within said springs for holding the end portions thereof fixedly in the first-mentioned lugs while permitting transverse movement, said lugs holding the springs and bolts axially of the casing and the motor.

14. In a vacuum cleaner, a cylindrical cas ing, means for supporting said casing so that its axis is horizontal when resting on a horizontal surface, a motor having a housing, and means for supporting said motor in said casing so that the rotor thereof. rotates on a horizontal axis when'the casing is disposed horizontally, said supporting means comprising pairs of apertured lugs on said housing, intermediate apertured lugs associated with said casing. coil springs passing through the apertures of the intermediate lugs and having end portions in the apertures of the first-mentioned lugs, bolts within said springs for holding the end portions thereof fixedly in the first-mentioned lugs, and spacing members.

between the lugs, said bolts and spacing members preventing relative'axial movement of the lugs, and said springs having limited movement between the lugs.

15. In a vacuum cleaner unit,a motor hav-- ing a housing including separable parts, sets of aligned lugs formed on said parts, coil springs interconnecting aligned lugs of each set, bolts extending within said springs and said lugs for holding said housing in assembled position, and supporting means associated with said springs for resiliently supporting said housin 16. In a vacuum cleaner. a motor having a housing including separable parts, sets of aligned lugs on said parts having apertures axially of said motor, supporting means comprising intermediate lugs having apertures therethrough in alignment with the firstmentioned apertures, coil springs having intermediate portions passing through said intermediate lugs and end portions in the lionsing lugs, and bolts extending within said springs and lugs for drawing the housing lugs together and holding the springs in load-supporting position.

17. In a vacuum cleaner, a cylindrical casing, means for supporting said casing horizontally above a horizontal surface, a motor having a housing including separable parts, means for supporting said motor so that its shaft extends axially of said casing comprising sets of aligned lugs on said housing parts having apertures axially of said motor, intermediate lugs extending inwardly from said casing having axial apertures therein, coil springs having intermediate portions passing through the intermediate lugs and end portions in the housing lugs, and bolts extending within said springs and lugs for drawing the housing lugs and easing parts together and holding the springs and the lugs in loadsupporting position.

18. In avacuum cleaner unit, a motor having a housing including separable parts, sets of aligned lugs formed on said parts, coil springs interconnecting aligned lugs of each set, bolts extending within said springs and said lugs for holding said housing in assembled position, said bolts having flanges thereon, said springs each having one end secured between a bolt and a lug, the other ends of said springs being formed with reduced turns engaging said flanges. and said bolts maintaining said springs under tension, and supporting means associated with intermediate portions of said s rings.

19. In a vacuum eFeaner unit, a motor having a housing including separable parts, sets of aligned lugs formed on said parts, coil springs interconnecting aligned lugs of each set, bolts extending within said springs and said lugs for holding said housing in assembled position, and supporting means associated with said springs for resiliently supporting said housing, one end of each spring being enlarged and abutting against the adjacent lug and clamped thereto by one of said bolts.

20. In an electrically driven vacuum cleaner, a casing, a motor unit within said casing, an insulating ring rigidly associated with said casing, partitions secured to said ring separating the easing into different chambers, means for supporting said motor unit on said ring. said insulating ring supporting said partitions and motor unit independently of each other.

21.. In an electrically driven vacuum cleaner, an extended casing, means for supporting said casing horizontally above a horizontal surface, a motor unit within said casing, an insulating ring extending circumferentially of and rigidly associated with said casing, partitions rigidly secured to said ring and separating the casing into different chambers, and means comprising coil springs for supporting said motor unit on said ring, said ring supporting said partitions and motor unit independently of each other.

In an electrically driven vacuum cleaner, a cylindrical casing, means for supporting said casing horizontally above a horizontal surface, a motor unit within said casing, an insulating ring extending circumferentially of and rigidly associated with said casing. partitions secured to said ring and separating the casing into different chambers, and means for supporting said motor unit on said ring comprising axially extending coil springs having yieldable portions, said partitions being rigidly secured to said ring and said ring supporting said partitions and motor unit independently of each other.

In a vacuum cleaner, a casing, a centrifugal fan, a driving motor therefor, a

shield mounted between said fan and said motor, said shield having an aperture through which air is drawn from said motor to said fan and said shield being spaced from said casing to form an annular air channel therebetween and means to'cause air which is discharged from said fan to pass between said shield and said casing andover said motor.

24. In a vacuum Cleaner, 21 motor-fan assembly comprising a motor and a fan, a ring means for supporting said motor-fan assembly on said ring, members rigidly secured to said ring and providing an inner casing'enclosing said motor-fan assembly, and members rigidly secured to said ring and provid ing an outer casing and enclosing said inner casing, said ring and said inner and outer casing members forming chambers at the front and rear of said'motor-fanassembly, said members being removable from said ring, and a dust bag and a bacteria filtering device mounted in the respectivechambers, said inner casing protecting the n iotor-fan assembly from said dust bag and said filtering device, and protecting said motor-fan assembly when the members providing said outer casing are removed. from said ring.

25. In a vacuum cleaner, a motor fan as-' sembly including a motor and an air fan member, an insulating support carrying said i motor-fan assembly, .members forming an inner'casing carried by said support independently of said motor-fan assembly, and members forming an outer casing surrounding said inner casing and secured to said support, said support andsaid inner and outer casing members formingchambers at the front and'rear of the motor-fan assembly for receiving air-treating devices, and said insulating support carrying said motor-fan assembly and said inner and outer casing members independently of one another and insulating said casing members from said motor.

26. In a vacuum cleaner, a casing member, an insulating ring secured to said casing member, a motor-fan assembly comprising a motor and tan member supported on said ring, current control members mounted on said ring, housing members enclosing said motor and said fan member, said housing members being mounted on said ring independently of said casing member and independently'of said motor-fan assembly, and means whereby said ring may be removed from said casing member carrying said motor-fan assembly, current control members and housing members as a unit.

27 In a vacuum cleaner, a casing member, an insulating ring secured to said casing member, a motor-fan assembly comprising a motor and fan member, means for resiliently supporting said motor-fan assembly on saidring, and a housing member for said fan member rigidly carried on said ring whereby said motor-fan assemblv and housing may be removed with said ring as a unit from said casing member and whereby said motor-fan assembly is free to vibrate independently of said housing member.

28.- In a vacuum cleaner, a casing-memher, an insulating ring secured to said casing member, a motor-fan assembly connrising a motor and a multi-stage fan resiliently supported on said ring, a first housing member abutting said ring and enclosing one stage of said fan, a second housing member abut ting said first housing member and enclosing another stage of said fan, and bolts extending between said ring and said second housing member for maintaining said ring and said housing members in clamped relationship.

29. In a vacuum cleaner, a main casing member, a motor unit, a support for said motor unit secured to said casing member, a casing cap mounted on said support, and a hood mounted on said support independently of said cap and said casing member, said hood cooperating with said casing member to en close said motor unit and with said cap to form a chamber and serving to shield said motor unit from said chamber, said hood having 'brush openings formed therein adapted to afford access to the motor brushes whereby said brushes may beadjusted and casing members secured in alignment to said ring to provide an enclosure, a motor-fan assembly comprising a motor and a fan member supported on said ring within said enclosure, current control members supported on said ring independently of said motor-fan assembly, and means for detaching said ring from said casing members and removing the motorfan assembly and current control members with the ring as a unit.

32. In a vacuum cleaner unit, an insulating ring, a motor unit carried by said ring, a coupling member and anelectric switch, said ring having a projection formed thereon, and means for supporting said coupling member on said projection, said ring having means for supporting said switch adjacent said projection with the operating handle extending through said ring adjacent said coupling member.

33. In a vacuum cleaner unit, an insulating ring, a motor unit carried by said ring, a coupling member and an electric switch, said ring having a projection formed thereon, means for supporting said coupling member on said projection, said ring having means for supporting said switch adjacent said projection with the operating handle extending through said ring adjacent said coupling member and a cap for said switch and said coupling member carried by said ring and surrounding said projection, said cap servin to shield and protect said coupling member and said switch.

34. In a vacuum cleaner unit, an insulating ring, a motor unit carried by said ring, a coupling member and an electric switch, said ring having a projection formed thereon, means for supporting said coupling member on said projection, said ring having means for supporting said switch adjacent said projection with the operating handle extending through said ring adjacent said coupling member, a cap for said switch and said coupling member carried by said ring and surrounding said projection. said cap serving to shield and protect said coupling member and said switch, and a transverse bar supported in said cap and operatively connected with said switch, said bar extending to the outside of said cap and providing a manual control for said motor.

35. In a vacuum cleaner, a ring of insulating material having an annular groove formed on one side for supporting a fan casing and having formed on the opposite side thereof a pair of grooves adapted to support an end cap and an end cover, respectively. and an extension formed on said ring for receiving a current control element, said ring having apertures peripherally spaced thereabout for receiving clamping bolts, and having a plurality of lugs formed thereon and peripherally spaced thereabout and adapted to receive and support a motor unit.

36. In a vacuum cleaner, a e lindrical casing, a motor assembly, means or supporting said motor assembly coaxially of said casing comprising axially extending coil springs peripherally spaced about said motor assem ly andextending between said motor assembly and said casing, and insulating means associated with said springs for insulating said motor assembly from said casing and for permitting limited relative movement therebetween.

37. In a vacuum cleaner unit, elements comprising a casing and a motor having a housing, a plurality of sets of lugs peripherally spaced about said casing and said motor, each set comprising a pair of spaced lugs associated with one of said elements and an intermediate lug associated with the other of said elements, and means for supporting said housing from said casing comprising coil springs respectively interconnecting the lugs of each set, said )airs of lugs being associated with the ends 0': said springs and said intermediate lugs being associated with the center portions of said springs.

38. In a vacuum cleaner unit, a motor having a housing comprising separable parts, sets of aligned lugs formed on said parts, springs respectively interconnecting aligned lugs of each set, bolts extending Within said springs and said lugs for holding said housing in assembled position, supporting means associated with said springs for resiliently supporting said housing, and means for maintaining said springs under tension whereby an increased rigidity is obtained for said support.

39. In a vacuum cleaner unit, elements comprising a casing and a motor, a lurality of sets of lugs peripherally spaced a out said casing and said motor, each set" comprising a pair of spaced lugs associatedwithone of said elements and an intermediate as and Y sociated with the other of St i id elfem means for supporting said-motor casing comprising extended coil 'sfprz spectively interconnecting the "-l set, said pairs of lugs being a v j the ends ofsaid springs and said int lugs being associated with the center pardons of said springs, and spacingasleevesmounted on said springs between saidlugs'and adapted to maintain the correct longitudi nal position of said motor. c

40. In a vacuum cleaner unit, elements comprising a casing and a motor, a plurality of sets of lugs peripherally spaced about said casing and said motor, each set eompri sing a pair of spaced lugs associated with one of said elements and an intern'iediate lug associated with the other of said elements, and means for supporting said motor from said casing comprising extended coil springs respectively interconnecting the lugs of each set, said pairs of lugs being associated with said - the ends of said springs and said intermediate lugs being associated with the center portions of said springs, and spacin sleeves of resilient material mounted on sai' springs between said lugs for maintaining said motor in correct longitudinal position and permitting limited relative movement thereof. v

41. In a vacuum cleaner unit, elements 10 comprising a casing and a motor, a plurality of sets of lugs peripherally spaced about said casing and said motor, each set comprising a pair of spaced lugs associated with one of said elements and an intermediate lug associated with the other of said elements, and means for supporting said motor from said casing comprising extended coil springs re-. spectively interconnecting the lugs of each set, said pairs of lugs being associated with the ends of said springs and said intermediate lugs being associated with the center portions of said springs, and sleeves of resilient insulating material between said springs and i said lugs and entirely enclosing said springs.

2 42. In a vacuum cleaner unit, elements comprising a casing and a motor, a lurality of sets oflugs peripherally spaced a out said casing and said motor, each set comprising a pair of spaced lugs associated with one of said elements and an intermediate lug associated with the other of said elements, and means for supporting said motor from said casing comprising extended coil springs respectively interconnecting thelugs of each set, said pairs of lugs being associated'with the ends of said springs and said intermediate lugs being associated with the center portions of said springs, sleeves of resilient insulating material between said springs and said lugs and entirely enclosing said springs, and spacing means associated with said sleeves and adapted to prevent longitudinal displacement of said motor.

In testimony whereof I hereunto afiix my signature.

TORD ERIK DANIEL BILDE.

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